Tunable asymmetric reflectance in silver films near the percolation threshold

Details Tunable asymmetric reflectance in silver films near the percolation threshold Tunable asymmetric reflectance in silver films near the percolation threshold

2010-10-25

arxiv.org/abs/1010.5231v3

Physics

Optics

18 pages, 5 figures, accepted by Journal of Applied Physics

Scientific paper

We report on the optical characterization of semicontinuous nanostructured silver films exhibiting tunable optical reflectance asymmetries. The films are obtained using a multi-step process, where a nanocrystalline silver film is first chemically deposited on a glass substrate and then subsequently coated with additional silver via thermal vacuum-deposition. The resulting films exhibit reflectance asymmetries whose dispersions may be tuned both in sign and in magnitude, as well as a universal, tunable spectral crossover point. We obtain a correlation between the optical response and charge transport in these films, with the spectral crossover point indicating the onset of charge percolation. Such broadband, dispersion-tunable asymmetric reflectors may find uses in future light-harvesting systems.

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